Hypodermic needle



1 o j 1644651'4 @Qt 4, A92?' G- N. HEIN s r HYPODERMIC NEEDLE Filed Oct. 12, 1925 IN1ENTOR AT ORNEYS Patented Get. 4, 1927.

NI "ili GEORGE N. HEIN, OF SAN FRANCISCQ, CALIFORNIA.

HYPODERMIC NEEDLE.

This invention relates to hypodermic needles, and more particularly to means and methods for locking the needle to the nozzle of the syringe.

The so-called Luer syringe, that is, one

having a glass barrel with a tapered slipjoint fit between the nozzle and the needle, is used extensively in administerlng hypodermic injections. Due to the use oi the tapered slip-joint a needle is liable to become loose under exceptional pressures and thus permit the solution to escape or the needle to be forcibly blown ofi", increasing possibilities of accidents.

In my Patent No. 1.524,242, granted January 27, 1925, I show anddescribe a lock for hypoderniic needles, which lock is in the nature of a helical spring.

The present invention is concerned particularly with the p-rovision of a needle base or socket which is especially adapted for the type of lock shown in said patent. In this patent I show a. conventional type of needle base, whereas in' the present application I have provideda needle base of special lform,

characterized by an axial and circumierential projection on the end of the base to enter between the coils of the spring so as to facilitate fitting and locking the parts together.

In the accompanying drawings:

Fig. 1 shows a longitudinal, central, sectional view of a portion of the syringe an needle embodying my invention.

Fig. 2 shows a longitudinal, central, sectional view of the base of a needle illust'rating a preferred form thereof.

Fig. 3 shows an end view of the base illustrated in Fig. 2. a

Fig. 4 shows a side elevation of a modied form of base.

Fig. 5-shows an end view of the same.

Fig. 6 shows a central, longitudinal, sectional view of a still further modified form of base. Fig. 7 shows a side elevation of the'base illustratedv in Fig. 6.

Fig. 8 shows a central, longitudinal, sec- 'tional view of a modified type of syringe nozzle fitted with a needle and locking mechanism embodying my invention.

Fig. 9 shows a form of my improved needle applied to a type having a straight nozzle instead of a tapered nozzle.

The usual so-called Luer syringe comprises a barrel 10, usually made of glass,

and a nipple 11, the latter slightlytapered.`

A needle 12 is secured toa base 13,.'which base has a tapered socket to receive the nipple. As a means of locking the needle in place,.I employ a helical spring 14,l preferably tapered. The mode of operation of the locking spring is explained in my aforesaid patent. Q f

The needle base illustrated in said patent is the conventional one, with its end out at right angles to the axis and preferably provided with a straight bead. The needle base herein disclosed is lof special construction and better suited for use with a springlockf of the type mentioned. t 1 f j As shown in Figs. 1 and 2, the needle base is formed with a helically cut end 15, upon which is a circun'iferentially projecting lip or thread 16. In Figs. 4 and 5 I show the end of the base indented, as indicated at 17, leaving a protruding portion 18, upon which is a flange or bead 19. In Figs. 6 and 7 I show a base with a helical cut end 2O and the circumference of the base is provided with screw threads 21.

In all of these forms the operation is the same, in that the spring is irst placed upon the nipple with the small end innermost. The needle base is then fitted over the nipple tween the base and the spring and the cir-` cumferential bead located on an axially projecting part of the'base enters between the coils of the spring very readily and easily.

In the formshown in Figs. 6 and 7 the locking spring'may be retained on the needle base permanently, owing to the provision of the number of threadsor grooves.

-and turned so that the projecting bead 0r loo In case it is desired to retain the spring l I have thus far referred only to the so- Y called Iiiuer syringe, but it is obvious that my improved needle base and lock can be applied to other types of syringes using av slip-joint. Among such other types is the one shown in Fig. 9 known as the Cook syringe, Where a straight nipple 22 is used and the needle 23 passes through a cork 24 into the interior of the barrel 25.

Various changes in the construction' and arrangement of the several parts herein` shown and described may be employed Without departing from the spirit of my invention as disclosed in the appended claims.

Having thusdescribed my invention, What I claim andV desire to secure by Letters Patent is- A1. A hypodermic needlek having a-base provided'with a' smooth bore socket to receive the nipple of a syringe, the end of said base being formed With an axially projecting p0rtion, and a circumferentially.projecting portion arranged on the axially projecting part.

2, A hypodermic needle having a base provided `With a smooth bore socket to receive thefnipple of the syringe, the end ofv said base being-cutona bias, and a circuinferen tially projecting member on said end.

3. A hypodermic needle having a base provided vvith a smooth bore socket to receive the, nipple of a syringe, the end of said base being cut helically, and a circumferential bead oi" thread formed on Said helically a base having a socket to receive said nipple,r a helical spring engaging the said nipple and base for locking the parts together, said base being provided at its end adjacent to thespring with an axial-1 and circumferential projection to enter between the coils of the spring When the basey and nipple turned relatively.

GEORGE lN. nnin. 

